Environmental assessment of multi-functional building elements constructed with digital fabrication techniques
Author / Producer
Date
2018-11
Publication Type
Journal Article
ETH Bibliography
yes
Citations
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Rights / License
Abstract
Purpose
Digital fabrication is revolutionizing architecture, enabling the construction of complex and multi-functional building elements. Multi-functionality is often achieved through material reduction strategies such as functional or material hybridization. However, these design strategies may increase environmental impacts over the life cycle. The integration of functions may hinder the maintenance and shorten the service life. Moreover, once a building element has reached the end of life, hybrid materials may influence negatively its recycling capacity. Consequently, the aim of this paper is to analyze the influence of multi-functionality in the environmental performance of two digitally fabricated architectural elements: The Sequential Roof and Concrete-Sandstone Composite Slab and to compare them with existing standard elements.
Methods
A method based on the life-cycle assessment (LCA) framework is applied for the evaluation of the environmental implications of multi-functionality in digital fabrication. The evaluation consists of the comparison of embodied impacts between a multi-functional building element constructed with digital fabrication techniques and a conventional one, both with the same building functions. Specifically, the method considers the lifetime uncertainty caused by multi-functionality by considering two alternative service life scenarios during the evaluation of the digitally fabricated building element. The study is extended with a sensitivity analysis to evaluate the additional environmental implications during end-of-life processing derived from the use of hybrid materials to achieve multi-functionality in architecture.
Results and discussion
The evaluation of two case studies of digitally fabricated architecture indicates that their environmental impacts are very sensitive to the duration of their service life. Considering production and life span phases, multi-functional building elements should have a minimum service life of 30 years to bring environmental benefits over conventional construction. Furthermore, the case study of Concrete-Sandstone Composite Slab shows that using hybrid materials to achieve multi-functionality carries important environmental consequences at the end of life, such as the emission of air pollutants during recycling.
Conclusions
The results from the case studies allow the identification of key environmental criteria to consider during the design of digitally fabricated building elements. Multi-functionality provides material efficiency during production, but design adaptability must be a priority to avoid a decrease in their environmental performance. Moreover, the high environmental impacts caused by end-of-life processing should be compensated during design.
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Publication status
published
External links
Editor
Book title
Journal / series
Volume
24 (6)
Pages / Article No.
1027 - 1039
Publisher
Springer
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Digital fabrication; End of life; Hybrid materials; LCA; Multi-functionality; Service life
Organisational unit
03972 - Habert, Guillaume / Habert, Guillaume
09566 - Dillenburger, Benjamin / Dillenburger, Benjamin
02284 - NFS Digitale Fabrikation / NCCR Digital Fabrication
02655 - Netzwerk Stadt u. Landschaft ARCH u BAUG / Network City and Landscape ARCH and BAUG
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
Funding
Related publications and datasets
Is cited by: https://doi.org/10.3929/ethz-b-000557858